N. Tokitoh et al., THERMAL RETROCYCLOADDITION OF 1,2,4,3-TRITHIAGERMOLANES - A NEW METHOD FOR GENERATION OF GERMANETHIONES, Heterocycles, 40(1), 1995, pp. 127-130
Thermolysis of 5,5-diphenyl-1,2,4,3-trithiagermolanes bearing bulky ar
omatic substituents on germanium atom resulted in the formation of nov
el germanium-sulfur double bond compounds, diarylgermanethiones, which
were found to undergo ready [2+2] and [2+4] cycloaddition reactions w
ith dimethyl acetylenedicarboxylate and 2,3-dimethyl-1,3-butadiene to
give a new class of germanium-containing heterocycles.